Question: Who was the leader of the Weimar republic ?
Paraphrase: Who was the pioneer of the Weimar republic ?
SPARQL (Wikidata):  select distinct ?obj where { wd:Q41304 wdt:P6 ?obj . ?obj wdt:P31 wd:Q5 } 
Answer: Philipp Scheidemann, Constantin Fehrenbach, Wilhelm Cuno, Wilhelm Marx, Gustav Stresemann, Franz von Papen, Heinrich Brüning, Hans Luther, Kurt von Schleicher, Hermann Müller, Gustav Bauer, Joseph Wirth